Elevator-brake.



C. MUELLER.

ELEVATOR BRAKE. APPLICATION HLED mu: 1. Ian) '1,249,453. r Patented M111, 1917.

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ELEVATOR BRAKE. 1

APPLICATION HLEO JUNE 7. 1911.

auueutmz I 6'? %wiiar cAnL MUELLER, or SHEBOYGAN, Wisconsin.

ELEVAT OR-BRAKE.

Specification of Letters Patent.

Patented Dec. 1 1, 1917'.

Application filed June 7. 1917. Serial No. 173,343.

To all whom it may concern:

Be it known that I, CARL MUELLER, a citizen of the United States, residing at Sheboygan, in the county of Sheboygan and State, .of Wisconsin, have invented. certain new and useful Improvements in Elevator Brakes; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appcrtains to make and use the same.

My invention relates to that class of deviccs intended to prevent elevators from dropping in case the raising and lowering cable thereof should break, or if the winding means for said cable should for any reason becoi'ne injured.

The object of the invention is to provide an extremely simple and inexpensive, yet a highly eflicient arrangement of parts for automatically applying a number of gripping dogs to the guide tracks of the ele vator, in case of accident, and with this general object in view, the invention resides in the novel features of construction and unique combinations of parts to be hereinafter fully described and claimed, the clescriptive matter being supplemented by the accompanying drawings which constitute a part of this application and in which:

Figure 1 is a side elevation of an elevator and its guide tracks, showing the applica tion of the invention;

Fig. 2 is an edge view of Fig. 1;

Fig. 3 is a similar view showing the action of parts in case of breakage of the cable;

Fig. 4 is a transverse section on the plane of the line H of Fig. 1;

Fig. 5 is a similar view on the plane indicated by the line 55 of Fig. 1.

In the drawings above briefly described, the numeral 1 designates an elevator platform from which standards 2 rise, said standards being connected at their upper ends by a horizontal bar 3. Suitable guides 1 are provided adjacent the upper and lower ends of the bars 2 for engagement with vertical tracks 5. The parts so far described are typical of one form of elevator commonly used for carrying freight, but it is to be understood that my invention is also applicable to all other kinds of elevator cars and cages.

Bearings 6 are suitabl upper and lower ends 0 mounted at the the elevator and toothed cam-like dogs 7 are pivoted tosaid bearings for engagement with thetracks 5 in case ofaccidenttp the raising, and lower ing means of the .device,., the upper and lower dogs being connected by vertical rods 8.,so that-theynoveirrunison. Links 9am pivoted to and rise from the upper dogs 7,

the upper ends of said links being pivoted to cross heads 10 on the ends of a horizontal bar 11 which extends above the bar 3, a central load lifting shackle 12 being secured to the center of said bar and receiving the bar The hoisting cable 13 is secured to the upper end of the shackle 12 and since the latter is limited in its upward movement by contact with bar 3, the links 9 androds 8 are prevented from swinging inwardly beyond dead center (see Fig. 2).

Vertically elongated arched guides 14 are secured at their lower ends to the bar 3 and the ends of bar 11 are mounted in said guides for vertical movement, said ends having vertical openings 15 which receive upstanding guide rods 17 which are positioned in the guides let and anchored to the upper ends thereof and to the bar 3. The rods 17 also act as guides for coiled springs 18 which surround said rods and bear against the upper ends of the guides 1-l and against the bar 11 to force said bar quickly downward in case the cable 13 should break, or if any other parts of the raising and lowering mechanism should become inoperative.

Whenever bar 11 is depressed by the springs 18, the links 9 rock the upper dogs 7 so as to bring the teeth thereof into ongagement with the tracks 5, the lower dogs being similarly rocked by the rods 8. It will thus be obvious that the car is held against falling and thus that injury to the occupants or to the freight on the elevator, will be averted.

The construction shown and described is simple and inexpensive, yet is highly eflicient, and it therefore constitutes the preferred form of the improved brake mechanism. I wish it understood, however, that within the scope of the invention as claimed, numerous minor changes may be made without sacrificing the principal advantages.

I claim:

In combination with an elevator, a pair of guide tracks at the opposite ends thereof, a horizontal bar disposed above said elevator having its ends positioned adjacent said tracks, a cable for raising and lowering the Copies of this patent may be obtained for five cents each, by addressing the thereby guiding the movement of the same, and springs surroundin said rods and bear ing downwardly on said bar for forcing the same toward the elevator to apply the dogs in case the cable should break.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

CARL MUELLER. Witnesses:

FELIX BENFEY, EVA BORGERT.

"Commissioner of Patents,

Washington, D. 0. 

